<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width: 200px;
            height: 200px;
            background-color:red;
            padding:50px;
            border:5px solid blue;
        }
    </style>
</head>
<body>
    <div>内存模型</div>
</body>
</html>